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## Section: New Results

### Extension language for Coq

Participants : Enrico Tassi, Feruccio Guidi [University of Bologna] , Claudio Sacerdoti Coen [University of Bologna] .

We continued our work on the design of a language mixing $\lambda$-prolog and constraint programming. This year, we redesigned and provided a new implementation of the constraint handling rules, leading to a first public release of the software. We are starting to have users beyond our own team:

In an article submitted for publication [24], we showed that Elpi could be used to give a short implementation of Type Theory.

We are also starting a collaboration to construct an elaborator for HOL-Light using Elpi.